Select all messages in conversation-Mac Mail Yosemite disabled

I am really bummed to learn that in Yosemite, for some reason, the Shift-Command-K shortcut in Mail, to “Select all messages in conversation” is now disabled when mail is not organized by conversation. I use this ALL the time. It is preventing me from upgrading to Yosemite on a computer.

Can this be scripted? Has it been done yet?

If it’s possible, I’d be willing to pay to have it done, especially if I could use KBSC to seamlessly invoke it.

Appreciate any info.